import React, { Component } from 'react'
import {
  createIncrementAction,
  createDecrementAction,
  createIncrementAsyncAction
} from '../../redux/actions/count'
// 引入connect用于连接UI组件与redux
import { connect } from 'react-redux'

// 定义UI组件
class Count extends Component {

  state = { count: 0 }

  // 加法
  increment = () => {
    const { value } = this.selectNumber
    this.props.jia(value * 1)
  }

  // 减法
  decrement = () => {
    const { value } = this.selectNumber
    this.props.jian(value * 1)
  }

  // 奇数再加
  incrementIfOdd = () => {
    const { value } = this.selectNumber
    if (this.props.count % 2 !== 0) {
      this.props.jia(value * 1)
    }
  }

  // 异步加
  incrementAsync = () => {
    const { value } = this.selectNumber
    this.props.jiaAsync(value, 500)
  }

  render() {
    console.log('UI组件接收到的props是', this.props);
    const { count } = this.props
    return (
      <div>
        <h2>我是Count组件，下方总人数为{this.props.renshu}</h2>
        <h4>当前求和为：{count}</h4>
        <select ref={c => this.selectNumber = c}>
          <option value="1">1</option>
          <option value="2">2</option>
          <option value="3">3</option>
        </select> &nbsp;
        <button onClick={this.increment}>+</button> &nbsp;
        <button onClick={this.decrement}>-</button> &nbsp;
        <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button> &nbsp;
        <button onClick={this.incrementAsync}>异步加</button> &nbsp;
      </div>
    )
  }
}

// 使用connect创建并暴露一个容器组件
// connect第一次调用必须传两个参数
export default connect(
  state => ({ count: state.he, renshu: state.rens.length }),
  // mapDispatchToProps 的简写，可以是一个 action 对象
  {
    jia: createIncrementAction,
    jian: createDecrementAction,
    jiaAsync: createIncrementAsyncAction
  }
)(Count)